Author Topic: Flat twin 60cc  (Read 4228 times)

Offline glorfindel

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Flat twin 60cc
« on: March 11, 2021, 02:08:49 PM »
The hirth coupling in the 160cc flat 4 was irritating me, so i decided to do a 'twin'.

60cc, with symetrical cylinders thus the 'fork' configuration of the conrods. Imperial system, 2 rings per piston, 10:1 compression ration (glow)

all allu is 6061t6, crank 1045, push rods, cam shaft and pins are drill rods (w1 tool steel).


here is the 3d model and the crank case i made so far.

« Last Edit: March 13, 2021, 12:20:34 PM by glorfindel »

Offline Jasonb

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Re: Flat twin 60cc
« Reply #1 on: March 11, 2021, 03:17:41 PM »
Off to a good start.

That looks a bit more than the usual hobby benchtop CNC  :o have you posted about it elsewhere and I've missed it

Offline Roger B

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Re: Flat twin 60cc
« Reply #2 on: March 11, 2021, 08:20:07 PM »
He is a CNC teacher and does this for a job  :)  :)  :) It's a 5 axis DMG 1250CTX mill/turn

https://www.modelenginemaker.com/index.php/topic,8770.msg195434.html#msg195434
Best regards

Roger

Offline Jasonb

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Re: Flat twin 60cc
« Reply #3 on: March 11, 2021, 08:29:56 PM »
Thanks Roger, bit of reading for me there (well looking at pictures)

Offline glorfindel

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Re: Flat twin 60cc
« Reply #4 on: March 11, 2021, 09:06:06 PM »
Off to a good start.

That looks a bit more than the usual hobby benchtop CNC  :o have you posted about it elsewhere and I've missed it
He is a CNC teacher and does this for a job  :)  :)  :) It's a 5 axis DMG 1250CTX mill/turn

https://www.modelenginemaker.com/index.php/topic,8770.msg195434.html#msg195434
Im teaching machanical engineering since 1997 ;-)

I'm a CatiaV5 cad/cam/fea teacher that appears to like engines and motor sports. ;-)

The final project i gave this week to one of my class is to design a small 15-30cc single 4 strokes engines.

Kids like that ;-)

So far, i made the edward radial 5, wich is 99% done, only intakes missing.

I also made a derived engine from the Nemett 15, wich is working.

Now i work on the 60cc twin. ;-)

Sorry for my bad english, french is my first language.

Btw, the cnc on the pic is a DMG DMU 50, 5 axis mill.

The DMG CTX 1250 was crashed by a student and is waiting for a new head ;-)

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Offline glorfindel

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Re: Flat twin 60cc
« Reply #5 on: March 16, 2021, 06:10:18 PM »
Since the tcx1250 is off duty, i did the sleeves the old way ;-)

C12L14 Reamed to 1-3/8"




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Offline Roger B

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Re: Flat twin 60cc
« Reply #6 on: March 16, 2021, 08:13:27 PM »
Looking good  :ThumbsUp: Your English is fine  :) I am well aware what my German sounds like to the locals ( I am English and living in German Switzerland).
Best regards

Roger

Offline glorfindel

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Re: Flat twin 60cc
« Reply #7 on: March 17, 2021, 05:49:23 PM »
Did the first step of the Rocker Support!!



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Offline glorfindel

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Re: Flat twin 60cc
« Reply #8 on: March 19, 2021, 08:17:00 PM »
Did some work today.



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Offline glorfindel

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Re: Flat twin 60cc
« Reply #9 on: March 26, 2021, 01:35:59 PM »
New parts done!! Glow plug hole missing.

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Offline glorfindel

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Re: Flat twin 60cc
« Reply #10 on: April 07, 2021, 02:46:26 AM »
I didnt like the bolt pattern and the threads for the intake/exhaust ports. So i redesigned it with a new bolt pattern and flanged intake/exhaust.

No need to do left/right side anymore.

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Offline glorfindel

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Re: Flat twin 60cc
« Reply #11 on: April 07, 2021, 08:04:01 PM »
Did the nose and the rockers today.

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Offline AVTUR

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Re: Flat twin 60cc
« Reply #12 on: April 08, 2021, 01:01:22 PM »
A nice engine - neither too simple nor too complex.

Is this your own design or are you making it from someone else's drawings?

AVTUR
There is no such thing as a stupid question.

Offline glorfindel

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Re: Flat twin 60cc
« Reply #13 on: April 08, 2021, 02:51:00 PM »
A nice engine - neither too simple nor too complex.

Is this your own design or are you making it from someone else's drawings?

AVTUR
I ordered the Jung flat 4 160cc plans and turned it in a 60cc flat twin , with new rods (fork configuration),  heads, pistons, rings, imperial measures (1-3/8" bore) etc...

I got lots of plans, taking idea left and right.

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Offline glorfindel

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Re: Flat twin 60cc
« Reply #14 on: April 08, 2021, 10:29:52 PM »
Cages done!! I used bronzebushing material.

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